Table 2 Risk of bias assessment for included studies according to the Cochrane Collaboration’s tool
First author | Random allocation | Hidden distribution | Blind method | Incomplete outcome data | Selective reporting of results | Other bias |
|---|---|---|---|---|---|---|
Jiang [10] | Randomized | No clear | No clear | Low | Low | Low |
Zou [11] | Randomized | No clear | No clear | Low | Low | Low |
Colleoni [12] | Randomized | No clear | No clear | Low | Low | Low |
Anderson [4] | Randomized | No clear | Double-blind | Low | Low | Low |
Lindquist [13] | No clear | No clear | No clear | Low | Low | Low |
Yuenyongviwat [14] | No clear | No clear | No clear | Low | Low | Low |
Huang [15] | Randomized | No clear | No clear | Low | Low | Low |